METHOD AND DEVICE FOR IDENTIFYING THE SYSTEM PARAMETERS STATOR RESISTANCE AND ROTOR RESISTANCE OF A TRANSMITTER-FREE INDUCTION MACHINE OPERATED IN A FIELD-ORIENTED MANNER

摘要

The invention relates to a method for identifying the system parameters, stator resistance (Rs) and rotor resistance (Rr), in a transmitter-free induction machine (DM) operated in a field-oriented manner, said method being carried out when the magnetized induction machine (DM) has come to a stop. According to the invention, a direct voltage (es) is initially supplied to the induction machine (DM) and a direct current actual value (is) determined, from which the stator resistance (Rs) is calculated. Next, a predefined torque set point (SM) is applied and a determined stator current actual phasor (is) and a calculated stator current model phasor (is) is transformed via a reference phasor (T*) in a field-oriented complex reference system and divided into real and imaginary components (BG, BG; WG, WG). A system deviation value (I DELTA ORTHOGONAL I, OMEGA ') is determined by means of these imaginary components (WG, WG) and used to modify the system parameter rotor resistance (Rr) in such a way that said system deviation (I DELTA ORTHOGONAL I, OMEGA ') becomes zero. In this way, it is possible especially in the lower and middle performance range of traction technology (local traffic) to identify the engine parameters stator resistance (Rs) and rotor resistance (Rr) of a transmitter-free induction machine (DM) operated in a field-oriented manner at each stop and immediately before driving off. As a result, the traction force required in each case can be precisely set by engine control.